Contents on 11 February '12
- Traffic Report -- no objects
- IAU Minor Planet Center
- Observers -- eleven observers
- Impact Risk Monitoring -- one object
- Consolidated Risk Tables - the CRT page (archive)
Of 440 risk-listed objects, 27 have had news in the last 31 days. Updated at 1610 UTC on 11 Feb.
- Earth's Busy Neighborhood close passer EBN Traffic Report
No objects are known to be within ten LD of Earth today. Updated at 1812 UTC on 11 Feb.
- Ephemerides for risk-rated & nearby objects + potential mission destinations
- News image catalog
- News old archive & Small Objects Archive
- Object Links - mainly for radar targets & close passers - updated 27 Jan.
- Observing Campaigns
Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.
Traffic Report on 11 February '12
No objects reported inside ten LD
No asteroids are reported to be within ten lunar distances (LD) of Earth today. Coming up, radar target 2011 CP4 arrives inside ten LD on February 22nd and 2008 EJ85 comes inside ten LD on March 4th.
This report was updated at 1653 UTC with new discovery 2012 CL17 (MPEC), which was inside ten LD earlier this month, and observation of 2011 CP4 from 2005 in today's DOU MPEC. This report was previously updated at 1612 UTC.
Notes: Ten LD has no astronomical significance but is a useful reporting boundary. Distances are interpreted by A/CC from JPL Horizons data. See also today's timeline plus current additional details, sky chart, and ephemerides.
NEOCP Activity on 11 February '12
The MPC's NEO Confirmation Page has 4 listings
When last checked at 2350 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of eight listings on the NEOCP today.
To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.
New MPECs on 11 February '12
Minor Planet Electronic Circulars
As of last check at 2349 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2012-C40 time-stamped "06:02 UT" - Daily Orbit Update - see below
- MPEC 2012-C41 time-stamped "13:11 UT" - 2011 YU75 - see below
- MPEC 2012-C42 time-stamped "13:25 UT" - 2012 CL17
MPEC 2012-C42 - "13:25 UT" - 2012 CL17
- K12C17L 2012 CL17 (risk-listed, Earth MOID=2.4 LD, i=4.4°, H=25.7 ~25m, close passer) from the Mt. Lemmon Survey (MLS) (Feb. 10.32-41p8 & 11.24-26p4) and Magdalena Ridge Obs. (MRO) (Feb. 11.22-24p4)
MPEC 2012-C41 - "13:11 UT" - 2011 YU75
- K11Y75U 2011 YU75 (Centaur, q=1.749 AU, Q=13.219 AU, H=17.0 ~1.35 km) from the Spacewatch 0.9m telescope (Dec. 26.46-50p3), the Catalina Sky Survey (CSS) (Jan. 21.27-29p4, Feb. 1.19-22p4 & 11.27-30p4), MLS (Feb. 1.35-37p4), and Bisei Spaceguard Center (Feb. 11.47-48p6)
- Observations of close-passing objects
- K11C04P 2011 CP4 (q=0.118 AU, arc=4 opp, H=21.2 ~195m, close passer, radar support) from Spacewatch 0.9m (2005 Feb. 14.28-31p2)
- Observation campaigns (radar support, potential mission destinations)
- K08G01E 2008 GE1 (arc=3 opp, H=19.6 ~407m, PMD) from Pan-STARRS 1 (PS1) (Feb. 10.26-27p2) and David Asher via Faulkes Telescope North (Feb. 10.52p3)
- K02A00W 2002 AW (arc=3 opp, H=20.8 ~234m, PMD) from Asher/Faulkes North (Feb. 10.51p3)
- D8911 138911 2001 AE2 (PMD) from PS1 (Feb. 10.26-27p2)
- D8175 138175 2000 EE104 (PMD) from CSS (Feb. 10.20-22p4)
- 29075 29075 1950 DA (radar) from PS1 (Feb. 9.35-36p2)
-- Potential mission destinations list & ephemerides -- Planetary radar schedules: Arecibo & Goldstone
- Observations of other asteroidal objects
- K12C17C 2012 CC17 (arc=7 days, H=20.5 ~269m) from Asher/Faulkes North (Feb. 10.51p3)
- K12C00T 2012 CT (arc=8 days, H=21.3 ~186m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Feb. 10.03-04p3) and CSS (Feb. 10.23-26p4)
- K12BC4D 2012 BD124 (arc=11 days, H=18.9 ~562m) from MLS (Feb. 10.39-42p4)
- K12B23T 2012 BT23 (arc=21 days, H=19.1 ~513m) from Cupillari Obs. (Feb. 10.04-08p3) and Faulkes Telescope South (Feb. 10.45-46p3)
- K12A13C 2012 AC13 (arc=28 days, H=19.8 ~371m) from MLS (Feb. 10.21-24p4)
- K11Y62U 2011 YU62 (Q=4.768 AU, arc=43 days, H=17.5 ~1.07 km) from Faulkes South (Feb. 10.44p3)
- K11SA2L 2011 SL102 (arc=3 opp, H=18.2 ~776m) from Asher/Faulkes North (Feb. 10.50p3)
- K06A08L 2006 AL8 (q=0.377 AU, Q=6.300 AU, arc=2 opp, H=18.4 ~708m) from South Obs. (Feb. 10.92-93p5)
- V4079 314079 2005 CV25 from MLS (Feb. 10.43-45p4)
- V2956 312956 1997 CZ3 from MLS (Feb. 10.38-41p4)
- I9008 189008 1996 FR3 from PS1 (Feb. 9.65-66p2)
- G2186 162186 1999 OP3 from Cupillari Obs. (Feb. 10.03-07p3)
- E3651 143651 2003 QO104 from CSS (Feb. 10.20-22p4)
- E1056 141056 2001 XV4 from PS1 (Feb. 9.24-31p4)
- D8524 138524 2000 OJ8 from CSS (Feb. 10.23-25p4)
- 90075 90075 2002 VU94 from MLS (Feb. 10.11-13p4)
- 86667 86667 2000 FO10 from PS1 (Feb. 10.64-65p2)
- 85839 85839 1998 YO4 from Cupillari Obs. (Feb. 10.03-07p3)
- 32906 32906 1994 RH from CSS (Feb. 10.20-22p4)
- 21088 21088 1992 BL2 from Cupillari Obs. (Feb. 7.08p1 & 10.02-06p2) and PS1 (Feb. 10.25-27p2)
- 08567 8567 1996 HW1 from PS1 (Feb. 10.29-30p2)
- 07358 7358 Oze (1995 YA3) from CSS (Feb. 10.14-15p4)
- 05836 5836 1993 MF from PS1 (Feb. 10.63-65p2)
- 02062 2062 Aten (1976 AA) from CSS (Feb. 10.14-15p4)
Observers on 11 February '12
Eleven observers appear in today's MPECs.
|Code||Observer / observatory|
|300||Bisei Spaceguard Center in Japan, 1 in MPEC 2012-C41 -- 2011 YU75|
|703||Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-C40 & 2012-C41 -- 2012 CT, 2011 YU75, 32906, 143651, 138524, 138175, 7358, 2062|
|807|||Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-C40 -- 2012 CT|
|I17||Cupillari Obs. in Pennsylvania, 4 in MPEC 2012-C40 -- 2012 BT23, 85839, 21088, 162186|
|F655||David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 4 in MPEC 2012-C40 -- 2012 CC17, 2011 SL102, 2008 GE1, 2002 AW|
|E10||Faulkes Telescope South in New South Wales, 2 in MPEC 2012-C40 -- 2012 BT23, 2011 YU62|
|H01||Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-C42 -- 2012 CL17|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2012-C40, 2012-C41 & 2012-C42 -- 2012 CL17, 2012 BD124, 2012 AC13, 2011 YU75, 90075, 314079, 312956|
|F51||Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2012-C40 -- 2008 GE1, 86667, 29075, 21088, 189008, 141056, 138911, 8567, 5836|
|J84||South Obs. in England, 1 in MPEC 2012-C40 -- 2006 AL8|
|691||Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2012-C40 & 2012-C41 -- 2011 YU75, 2011 CP4|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 11 February '12
Notes for Today's Latest Risk Assessments
|2012 CL17||JPL Sentry||1610||2095-2112||20||1.8e-06||-6.06||-6.58||0||JPL: "Analysis based on 16 observations spanning .94575 days (2012-Feb-10.31603 to 2012-Feb-11.26178)." Diameter approximately 0.025 km. from mean, weighted H=25.7.|
An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.
Chronology on 11 February '12
Times are UTC for when items were noted or added by The Tracking News.
|1653||Updated Traffic Report|
|1610||Noted that JPL Sentry has posted 2012 CL17 as an impact risk - see above|
Grabbed MPEC 2012-C40 - Daily Orbit Update - see above
Grabbed MPEC 2012-C41 - 2011 YU75 - see above
Grabbed MPEC 2012-C42 - 2012 CL17 - see above